Honda Knock Sensor 30530-5YS-J01 - Overview. The Honda Knock Sensor 30530-5YS-J01 is a critical component in Honda marine engine systems and automotive applications such as the 2018-2022 Honda Accord, 2019-2022 Acura RDX, and other compatible models. Serving within the engine control system, this sensor detects engine detonation or knocking and sends precise signals to the engine control module to adjust ignition timing accordingly. This real-time adjustment helps your engine run efficiently whi